My hair line is really uneven and recedes deeply above my temples. How can this be fixed? (photos)

If you are losing hair and want treatment options you should schedule a consultation with a doctor.  Photos are not very helpful without a proper examination.

There are plenty of great hair loss treatments available such as PRP with Progesterone, or hair transplant. I'd suggest you consult a hair expert to discuss the best treatment options for you. 

You
mentioned that your hairline has been this way for as long as you can remember,
but that you are becoming more aware of it— I think perhaps, just more
conscious/critical about it.  Never fear,
there is a solution.  You may have a hair
transplant which can restore the hairline and fill the corners.  Second, if the hairline bothers you in the
meantime (while you decide on a hair transplant), do not pull your hair back in
a ponytail as that will draw more attention to hairline.  A ponytail may place unnecessary traction on
the hairs in front (traction alopecia). Third, consider wearing bangs to hide
the hairline while you decide.  Lastly,
see a hair restoration specialist to further discuss your options.

there are many reasons your hairline can be changing, from genetics to hormone changes. I recommend you visit with a hair loss expert. The good news is that with transplant you should be able to make the changes you are looking for. However, it is equally important to ensure you stop your hair loss. 

I advice you have a FUE; you would get the desired hairline in just one sesssion of dense packing hair transplant.hair grafting/ transplant can be an option or forehead reduction and correcting  asymmetry on your frontal hair line/forelock.